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Question

# A moving body of mass m and velocity v after colliding from a wall returns back (rebounds) with velocity v. The change in momentum will be

A
$$mv$$
B
$$2 \,mv$$
C
$$-mv$$
D
zero
Solution
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#### Correct option is A. $$2 \,mv$$$$∆P=P_i-P_f$$$$∆P=mv-m(-v)$$$$∆P=2mv$$

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